Planographic printing plate packaging structure and method for packaging planographic printing plate

Abstract

A stack of planographic printing plates is accommodated in a packaging box for planographic printing plates in a manner such that imaging surfaces of the planographic printing plates are directed toward a bottom face plate. Therefore, when the packaging box for planographic printing plates is opened in a manner such that top face plates are directed upwards, the imaging surfaces of the planographic printing plates are directed downwards.

1. A planographic printing plate packaging product comprising:
 a stack of planographic printing plates that each includes one surface as an imaging surface; and 
 a packaging box that accommodates the stack of planographic printing plates, the packaging box including an entrance for manually taking out the printing plates accommodated therein; and 
 a plurality of sheets of cardboard at intervals of the printing plates for protecting the printing plates from damage or deformation due to an external force acting on the packaging box; 
 wherein the planographic printing plates are accommodated and packaged in the packaging box in a manner such that the imaging surfaces of the planographic printing plates are directed to a side opposing the entrance, and at least one of the imaging surfaces include a recording layer having a solubility that changes with respect to a developer when the recording layer is irradiated with a laser beam; and 
 wherein the imaging surface of each planographic printing plate is completely covered with an interleaf sheet. 
 
     
     
       2. The planographic printing plate packaging product according to  claim 1 , wherein the packaging box comprises a pair of top face plates and a bottom face plate, a plurality of fold lines are formed on wing portions provided respectively on opposing sides of the top face plates and the bottom face plate, and the entrance is assembled in a door form by folding the plurality of fold lines of the top face plates. 
     
     
       3. The planographic printing plate packaging product according to  claim 2 , wherein the imaging surfaces of the planographic printing plates each include a recording layer comprising a solubility that changes with respect to a developer when the recording layer is irradiated with a laser beam. 
     
     
       4. The planographic printing plate packaging product according to  claim 1 , wherein the packaging box comprises a main body, a roof portion, and a bottom plate, the main body including side portions which extend from respective edges of the bottom plate, the side portions including several folds forming sections covering side portions of the planographic printing plates. 
     
     
       5. The planographic printing plate packaging product according to  claim 4 , further comprising cores accommodated in the sections covering the side portions of the planographic printing plates, which form reinforcing portions. 
     
     
       6. The planographic printing plate packaging product according to  claim 5 , wherein the imaging surfaces of the planographic printing plates each include a recording layer comprising a solubility that changes with respect to a developer when the recording layer is irradiated with a laser bean. 
     
     
       7. The planographic printing plate packaging product according to  claim 4 , wherein the imaging surfaces of the planographic printing plates each include a recording layer comprising a solubility that changes with respect to a developer when the recording layer is irradiated with a laser beam. 
     
     
       8. The planographic printing plate packaging product of  claim 1 , wherein the recording layer contains an infrared ray absorbent, a compound which generates an acid when heated, and a compound which is cross-linked by acids. 
     
     
       9. The planographic printing plate packaging product of  claim 1 , wherein the recording layer contains an infrared ray absorbent, and a compound which becomes soluble in an alkali when heated. 
     
     
       10. The planographic printing plate packaging product of  claim 1 , wherein the recording layer comprises a layer containing a compound which generates a radical when irradiated with a laser beam, a binder which is soluble in an alkali, and a polyfunctional monomer or prepolymer; and an oxygen-blocking layer. 
     
     
       11. The planographic printing plate packaging product of  claim 1 , wherein the recording layer comprises a physical development nucleus layer and a silver halide emulsion layer. 
     
     
       12. The planographic printing plate packaging product of  claim 1 , wherein the recording layer comprises a polymer layer containing a polyfunctional monomer and a multifunctional binder, a layer containing silver halide and a reducing agent, and an oxygen-blocking layer. 
     
     
       13. A method for packaging planographic printing plates comprising the steps of:
 (a) providing a packaging box including an entrance for manually removing the planographic printing plates accommodated therein; 
 (b) accommodating and packaging the planographic printing plates that each include one surface as an imaging surface in the packaging box with the planographic printing plates accommodated and packaged in the packaging box such that the imaging surface of each of the planographic printing plates is directed away from the entrance, 
 wherein the imaging surface includes a recording layer having a solubility that changes with respect to a developer when the recording layer is irradiated with a laser beam; and 
 wherein the step of accommodating further comprises, for each planographic printing plate, accommodating art interleaf sheet that completely covers the imaging surface of each of the planographic printing plates, and accommodating a plurality of sheets of cardboard at intervals of the printing plates for protecting the printing plates from damage or deformation due to an external force acting on the packaging box. 
 
     
     
       14. The method for packaging planographic priming plates according to  claim 13 , further comprising the step of assembling a plate which comprises a pair of top face plates each including wing portions on opposing sides thereof and comprising fold lines in the wing portions, and a bottom face plate to form the packaging box by folding the plurality of fold lines to form the entrance in a door included with the entrance. 
     
     
       15. The method for packaging planographic printing plates according to  claim 13 , further comprising the steps of:
 (c) assembling a main body, which includes folding side portions of the main body several times to form sections for covering side portions of the planographic printing plates; and 
 (d) mounting a roof portion to the main body. 
 
     
     
       16. The method for packaging planographic printing plates according to  claim 15 , further comprising the step of accommodating cores in the sections for covering the side portions of the planographic printing plates. 
     
     
       17. The method of  claim 13 , wherein the recording layer contains an infrared ray absorbent, a compound which generates an acid when heated, and a compound which is cross-linked by acids. 
     
     
       18. The method of  claim 13 , wherein the recording layer contains an infrared ray absorbent, and a compound which becomes soluble in an alkali when heated. 
     
     
       19. The method of  claim 13 , wherein the recording layer comprises a layer containing a compound which generates a radical when irradiated with a laser beam, a binder which is soluble in an alkali, and a polyfunctional monomer or prepolymer; and an oxygen-blocking layer. 
     
     
       20. The method of  claim 13 , wherein the recording layer comprises a physical development nucleus layer and a silver halide emulsion layer. 
     
     
       21. The method of  claim 13 , wherein the recording layer comprises a polymer layer containing a polyfunctional monomer and a multifunctional binder, a layer containing silver halide and a reducing agent, and an oxygen-blocking layer.